* string.c (rb_str_byteslice): Add String#byteslice. [ruby-core:35376]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30991 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 29 insertions, 0 deletions

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index c5d3a53850..f18c8148e4 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -1944,4 +1944,33 @@ class TestString < Test::Unit::TestCase
     assert_equal(S("hello world"), a)
     assert_equal(S("hello "), b)
   end
+
+  def b(str)
+    str.force_encoding(Encoding::ASCII_8BIT)
+  end
+
+  def test_byteslice
+    assert_equal(b("h"), "hello".byteslice(0))
+    assert_equal(nil, "hello".byteslice(5))
+    assert_equal(b("o"), "hello".byteslice(-1))
+    assert_equal(nil, "hello".byteslice(-6))
+
+    assert_equal(b(""), "hello".byteslice(0, 0))
+    assert_equal(b("hello"), "hello".byteslice(0, 6))
+    assert_equal(b("hello"), "hello".byteslice(0, 6))
+    assert_equal(b(""), "hello".byteslice(5, 1))
+    assert_equal(b("o"), "hello".byteslice(-1, 6))
+    assert_equal(nil, "hello".byteslice(-6, 1))
+
+    assert_equal(b("h"), "hello".byteslice(0..0))
+    assert_equal(b(""), "hello".byteslice(5..0))
+    assert_equal(b("o"), "hello".byteslice(4..5))
+    assert_equal(nil, "hello".byteslice(6..0))
+    assert_equal(b(""), "hello".byteslice(-1..0))
+    assert_equal(b("llo"), "hello".byteslice(-3..5))
+
+    assert_equal(b("\x81"), "\u3042".byteslice(1))
+    assert_equal(b("\x81\x82"), "\u3042".byteslice(1, 2))
+    assert_equal(b("\x81\x82"), "\u3042".byteslice(1..2))
+  end
 end